import {z} from 'zod'

export type CompletionsPrompt = string | Array<string> | Array<number> | Array<Array<number>>;

export type StreamOptions = {include_usage?: (boolean | null) | undefined};

export type CompletionsRequest = {best_of?: (number | null) | undefined, echo?: (boolean | null) | undefined, frequency_penalty?: (number | null) | undefined, logit_bias?: ({[key: string]: number} | null) | undefined, logprobs?: (number | null) | undefined, max_tokens?: (number | null) | undefined, model: string, n?: (number | null) | undefined, presence_penalty?: (number | null) | undefined, prompt: CompletionsPrompt, seed?: (number | null) | undefined, stop?: (Array<string> | null) | undefined, stream?: (boolean | null) | undefined, stream_options?: (StreamOptions | null) | undefined, suffix?: (string | null) | undefined, temperature?: (number | null) | undefined, top_p?: (number | null) | undefined, user?: (string | null) | undefined};

export type CreateApiV1CompletionsArgs = {body: CompletionsRequest};

export type CreateApiV1CompletionsOptions = {baseUrl?: string | undefined, bearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const logProbs = z.object({text_offset: z.array(z.number().int().gte(0)), token_logprobs: z.array(z.number()), tokens: z.array(z.string()), top_logprobs: z.array(z.record(z.string(), z.number()))});

export const completionChoice = z.object({finish_reason: z.string(), index: z.number().int(), logprobs: logProbs.nullable().optional(), text: z.string()});

export const completionTokensDetails = z.object({accepted_prediction_tokens: z.number().int().gte(0), audio_tokens: z.number().int().gte(0), reasoning_tokens: z.number().int().gte(0), rejected_prediction_tokens: z.number().int().gte(0)});

export const promptTokensDetails = z.object({audio_tokens: z.number().int().gte(0), cached_tokens: z.number().int().gte(0)});

export const usage = z.object({completion_tokens: z.number().int().gte(0), completion_tokens_details: completionTokensDetails, prompt_tokens: z.number().int().gte(0), prompt_tokens_details: promptTokensDetails, total_tokens: z.number().int().gte(0)});

export const completionsResponse = z.object({choices: z.array(completionChoice), created: z.number().int(), id: z.string(), model: z.string(), object: z.string(), system_fingerprint: z.string(), usage: usage});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Create completions
 * 
 * POST /v1/completions
 */
export const createApiV1Completions = async (args: CreateApiV1CompletionsArgs, options?: CreateApiV1CompletionsOptions) => {
const {baseUrl = "https://api.atoma.network", fetch: fetchFn = fetch, bearerAuth} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('content-type', "application/json")
headers.set('accept', "application/json")

if (bearerAuth !== undefined) headers.set('authorization', `Bearer ${bearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/completions${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(completionsResponse, await res.json())
};